METHOD FOR DETECTING JOINED POINT OF BAND PLATE IN HOT ROLLING AND DEVICE THEREFOR

摘要

PROBLEM TO BE SOLVED: To improve reliability on detection of a joined point by more accurately detecting the joined point of the tail end of a preceding band plate with the tip of the succeeding band plate than the conventional method and also preventing disturbance such as cooling water stuck to the surface of the band plate, oxidized film generated on the surface of the band plates and burrs in the joined point part generated at the time of joining. SOLUTION: At the time of detecting the position of the joined point 10c of the tail end 10a of the preceding band plate 10 which is rough hot rolled with the tip 10b of the succeeding band plate 10 after the tail end 10a and tip 10b are joined with a flying joining device 2, in the position of the fixed point on the downstream side of the flying joining device 2, the temp. of band plate is detected continuously in the length direction of the band plate 10 with a radiation thermometer 15 and high- temp. changed parts where the temp. is over the reference value in the length direction are specifically detected. Moreover, the temps. of band plate at many points in the width direction of the band plate 10 are simultaneously detected with the radiation thermometer 15 and the peak temp. among the temps. of band plate at these many points is specified as the temp. of the band plate.